Description
When does a project need an ACB instead of an MCCB?
An ACB is specified when current ratings exceed roughly 1600A-2000A, typically as the main incomer breaker protecting the entire installation from a transformer or generator, rather than protecting a single downstream feeder.
- Rated up to 6300A depending on the frame size selected
- Fixed and withdrawable (drawout) versions — drawout ACBs allow maintenance without fully de-energizing the switchboard
- Electronic trip units with adjustable protection curves, often with communication/monitoring capability
Who specifies ACBs on Nigerian projects?
M&E consultants and EPC contractors on industrial plants, data centres, large commercial towers, and utility substations are the main buyers of ACBs, since these are the projects where main incomer current exceeds MCCB range. Fembosco supplies ACBs both as standalone breakers and fitted into custom-built main distribution panels.
Frequently Asked Questions
What’s the difference between a fixed and a withdrawable ACB?
A fixed ACB is bolted permanently into the panel; a withdrawable (drawout) version can be pulled out on rails for maintenance or replacement without shutting down the rest of the switchboard, which is preferred on critical installations that can’t tolerate extended downtime.
Can Fembosco fit an ACB into a new main distribution panel build?
Yes — ACBs are commonly specified as part of Fembosco’s custom panel-building service for main incomer protection.
